Extended chords are tertian chords (built from thirds) or triads with notes extended, or added, beyond the seventh, including all the thirds in between the seventh and the extended note. Thus ninth, eleventh, thirteenth, and all farther chords are extended chords. In music or music theory, tertian is the quality of a chord constructed from thirds, and other things constructed from thirds such as counterpoint. ... In music and music theory, a chord (from the middle English cord, short for accord) is three or more different notes or pitches sounding simultaneously, or nearly simultaneously, over a period of time. ... In music, see the following intervals: Major third Minor third The mediant, and the chord built on the mediant, is often called simply the third, as it is the third degree of the diatonic scale. ... In music or music theory, a triad is a tonal or diatonic tertian trichord. ... In music, see the intervals: seventh, musical group Major seventh minor seventh The leading tone or subtonic, and the chord built on the leading tone, is often called simply the seventh as it is the seventh scale degree. ... In music or music theory a ninth is the note nine scale degrees from the root of chord and also the interval between the root and the ninth. ... In music or music theory an eleventh is the note eleven scale degrees from the root of chord and also the interval between the root and the eleventh. ... In music or music theory a thirteenth is the note thirteen scale degrees from the root of chord and also the interval between the root and the thirteenth. ...

In popular music and jazz music, these chords are often referred to as added note chords, and are referred to by the simple interval rather than the compound interval (i.e., "added sixth chord" as opposed to "thirteenth chord").

In practice however, extended chords do not typically use all the chord members; the fifth is often omitted, as are notes between the seventh and the highest note (i.e., the ninth is omitted in an eleventh chord, the ninth and eleventh are omitted in a thirteenth chord).

Extended chords are rarely seen in the Baroque era, and are uncommon in the Classical era. When used in the Romantic era, they were almost always found on the dominant scale degree (as V⁹, V¹¹, and V¹³). Baroque music is Western classical music from the Baroque era, after the Renaissance music era and before the Classical music era proper. ... The Classical period in Western music occurred in a large part of the 18th century, and into the early 19th century. ... Romantic music is defined as the period of European classical music that runs roughly from the early 1800s to the first decade of the 20th century, as well as music written according to the norms and styles of that period. ... The word dominant has several possible meanings: In music theory, the dominant or dominant note (second most important) of a key is that which is a perfect fifth above the tonic; in just intonation the note whose pitch is 1. ...

Performance

When playing extended chords on instruments which are limited to four or less tones it is important to select which notes to play so as to still give the sonority or effect as the intended extended chord. Always play the root, third, seventh, and the most extended note if possible. The root is the central note of the chord, the third defines the chord's quality as minor or major, the extended note is what makes the chord extended, and the seventh defines the chord as an extended chord and not an added note chord. Any notes which happen to be altered, such as a flatted ninth, would also need to be included. Thus in a thirteenth chord one would play the root, third, seventh, and thirteenth, and be able to leave out the fifth, ninth, and eleventh. A database query syntax error has occurred. ... Primary and secondary roots in a cotton plant In vascular plants, the root is that organ of a plant body that typically lies below the surface of the soil (compare with stem). ... In music, see the following intervals: Major third Minor third The mediant, and the chord built on the mediant, is often called simply the third, as it is the third degree of the diatonic scale. ... In music, see the intervals: seventh, musical group Major seventh minor seventh The leading tone or subtonic, and the chord built on the leading tone, is often called simply the seventh as it is the seventh scale degree. ... An added tone chord is a triadic chord with an extra added note, such as the added sixth. ...